Imbus/xv6-riscv-kernel
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Add serial port input/output.

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Delete parallel port output.
Works well with qemu -nographic mode.
This commit is contained in:
rsc 2009-05-31 00:24:11 +00:00
parent 0ca9ca0c55
commit 74afa70d30
4 changed files with 87 additions and 23 deletions
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28
console.c
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@ -1,6 +1,6 @@
// Console input and output.
// Input is from the keyboard only.
// Output is written to the screen and the printer port.
// Input is from the keyboard or serial port.
// Output is written to the screen and serial port.
#include "types.h"
#include "defs.h"
@ -13,31 +13,13 @@
#include "x86.h"
#define CRTPORT 0x3d4
#define LPTPORT 0x378
#define BACKSPACE 0x100
static ushort *crt = (ushort*)0xb8000; // CGA memory
static struct spinlock console_lock;
int panicked = 0;
int use_console_lock = 0;
// Copy console output to parallel port, which you can tell
// .bochsrc to copy to the stdout:
// parport1: enabled=1, file="/dev/stdout"
static void
lptputc(int c)
{
int i;
for(i = 0; !(inb(LPTPORT+1) & 0x80) && i < 12800; i++)
;
if(c == BACKSPACE)
c = '\b';
outb(LPTPORT+0, c);
outb(LPTPORT+2, 0x08|0x04|0x01);
outb(LPTPORT+2, 0x08);
}
volatile int use_console_lock = 0;
static void
cgaputc(int c)
@ -80,14 +62,14 @@ consputc(int c)
;
}
lptputc(c);
uartputc(c);
cgaputc(c);
}
void
printint(int xx, int base, int sgn)
{
static char digits[] = "0123456789ABCDEF";
static char digits[] = "0123456789abcdef";
char buf[16];
int i = 0, neg = 0;
uint x;